Fluorescent Mineral Database

A new secret project! Trying to create a nice Fluorescent Mineral Database (FMDB), which would be searchable by mineral, locality, and luminescence properties. Also making it easy for people to contribute with their own specimens!

Hokkaidoite from the Shikaribetsu Lake, Hokkaido Prefecture, Japan

Contributed by: Simone Conti
minID: 90E-P19
Date: Jun 4th, 2025
Locality: Shikaribetsu Lake, Shikaoi (Shikaoi-Ch?), Kato District, Tokachi Subprefecture, Hokkaid? Prefecture, Japan (See on Mindat)
Size: 4 x 3 x 5 cm
Weight: 60.37 g

Description:
Very nice sample of hokkaidoide grains embedded in opal. Under longwave UV light the hokkaidoide fluoresces brilliant green, while the opal fluoresces a rainbow of colors: from purple and blue to pink, orange, and yellow. A raw specimen, no saw cut on any side, with matrix on top and bottom.

Fluorescence under longwave UV light.
Fluorescence under longwave UV light.
Normal light.
Normal light.

Summary of luminescence responses:

Hokkadoite

  • Fluorescence under Longwave (365nm LED) UV light: Green
Opal
  • Fluorescence under Longwave (365nm LED) UV light: Yellow

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